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    【题目】Americans eat ______ vegetables per person today as they did in 1990.
    A.more than twice
    B.as twice as many
    C.twice as many as
    D.more than twice as many

    【答案】D
    【解析】句意：美国人现在每天吃的蔬菜是1990年的两倍。倍数表达方式：倍数+as…as…，第一个as后加形容词或副词，第二个as后加比较对象，故选D.

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